Inventories - Schedule of Finished Goods Inventories (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Jan. 02, 2021
Inventory Disclosure [Abstract]
Finished beds, including retail display beds and deliveries in-transit to those customers who have utilized home delivery services	$ 40,686	$ 21,442
Finished components that were ready for assembly for the completion of beds	32,835	28,108
Retail accessories	20,288	19,110
Finished goods inventory	$ 93,809	$ 68,660

Carrying amount as of the balance sheet date of merchandise ready for assembly that are included in the finished goods inventory as finished components.

No definition available.

Name:	snbr_FinishedComponentsIncludedInFinishedGoodsInventoryNet
Namespace Prefix:	snbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant